EP4287339A1 - Électrolyte non aqueux pour batterie secondaire au lithium et batterie secondaire au lithium le comprenant - Google Patents
Électrolyte non aqueux pour batterie secondaire au lithium et batterie secondaire au lithium le comprenant Download PDFInfo
- Publication number
- EP4287339A1 EP4287339A1 EP22881277.2A EP22881277A EP4287339A1 EP 4287339 A1 EP4287339 A1 EP 4287339A1 EP 22881277 A EP22881277 A EP 22881277A EP 4287339 A1 EP4287339 A1 EP 4287339A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- secondary battery
- lithium secondary
- electrolyte solution
- aqueous electrolyte
- lithium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 54
- 150000001875 compounds Chemical class 0.000 claims abstract description 82
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 24
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 24
- 125000004432 carbon atom Chemical group C* 0.000 claims description 22
- 239000007774 positive electrode material Substances 0.000 claims description 21
- 239000007773 negative electrode material Substances 0.000 claims description 20
- 239000011356 non-aqueous organic solvent Substances 0.000 claims description 18
- 235000019000 fluorine Nutrition 0.000 claims description 17
- 125000001153 fluoro group Chemical group F* 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- 125000002947 alkylene group Chemical group 0.000 claims description 8
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- 150000002825 nitriles Chemical class 0.000 claims description 5
- 229910000077 silane Inorganic materials 0.000 claims description 5
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- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
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- IFDLFCDWOFLKEB-UHFFFAOYSA-N 2-methylbutylbenzene Chemical compound CCC(C)CC1=CC=CC=C1 IFDLFCDWOFLKEB-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- LWLOKSXSAUHTJO-UHFFFAOYSA-N 4,5-dimethyl-1,3-dioxolan-2-one Chemical compound CC1OC(=O)OC1C LWLOKSXSAUHTJO-UHFFFAOYSA-N 0.000 description 1
- LSUWCXHZPFTZSF-UHFFFAOYSA-N 4-ethyl-5-methyl-1,3-dioxolan-2-one Chemical compound CCC1OC(=O)OC1C LSUWCXHZPFTZSF-UHFFFAOYSA-N 0.000 description 1
- AUXJVUDWWLIGRU-UHFFFAOYSA-N 4-propyl-1,3-dioxolan-2-one Chemical compound CCCC1COC(=O)O1 AUXJVUDWWLIGRU-UHFFFAOYSA-N 0.000 description 1
- 229910017048 AsF6 Inorganic materials 0.000 description 1
- 101100317222 Borrelia hermsii vsp3 gene Proteins 0.000 description 1
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910016861 F9SO3 Inorganic materials 0.000 description 1
- 229910005143 FSO2 Inorganic materials 0.000 description 1
- 229910003936 Li(Ni0.5Mn0.3Co0.2)O2 Inorganic materials 0.000 description 1
- 229910004499 Li(Ni1/3Mn1/3Co1/3)O2 Inorganic materials 0.000 description 1
- 229910010088 LiAlO4 Inorganic materials 0.000 description 1
- 229910003253 LiB10Cl10 Inorganic materials 0.000 description 1
- 229910012709 LiCo1-Y2MnY2O2 Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910014370 LiMn2-zNizO4 Inorganic materials 0.000 description 1
- 229910014552 LiMn2−zNizO4 Inorganic materials 0.000 description 1
- 229910002993 LiMnO2 Inorganic materials 0.000 description 1
- 229910014170 LiNi1-Y1CoY1O2 Inorganic materials 0.000 description 1
- 229910014380 LiNi1-yMnyO2 Inorganic materials 0.000 description 1
- 229910014946 LiNi1−yMnyO2 Inorganic materials 0.000 description 1
- 229910003005 LiNiO2 Inorganic materials 0.000 description 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 1
- 229910016622 LixFe2O3 Inorganic materials 0.000 description 1
- 229910015103 LixWO2 Inorganic materials 0.000 description 1
- XOBKSJJDNFUZPF-UHFFFAOYSA-N Methoxyethane Chemical compound CCOC XOBKSJJDNFUZPF-UHFFFAOYSA-N 0.000 description 1
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 1
- 229910008326 Si-Y Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006773 Si—Y Inorganic materials 0.000 description 1
- 229910020997 Sn-Y Inorganic materials 0.000 description 1
- 229910008859 Sn—Y Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- NXPZICSHDHGMGT-UHFFFAOYSA-N [Co].[Mn].[Li] Chemical compound [Co].[Mn].[Li] NXPZICSHDHGMGT-UHFFFAOYSA-N 0.000 description 1
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 1
- RLTFLELMPUMVEH-UHFFFAOYSA-N [Li+].[O--].[O--].[O--].[V+5] Chemical compound [Li+].[O--].[O--].[O--].[V+5] RLTFLELMPUMVEH-UHFFFAOYSA-N 0.000 description 1
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- BTGRAWJCKBQKAO-UHFFFAOYSA-N adiponitrile Chemical compound N#CCCCCC#N BTGRAWJCKBQKAO-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- LJCFOYOSGPHIOO-UHFFFAOYSA-N antimony pentoxide Inorganic materials O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 description 1
- 229910000411 antimony tetroxide Inorganic materials 0.000 description 1
- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229960000074 biopharmaceutical Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000417 bismuth pentoxide Inorganic materials 0.000 description 1
- 229910021475 bohrium Inorganic materials 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- VUPKGFBOKBGHFZ-UHFFFAOYSA-N dipropyl carbonate Chemical compound CCCOC(=O)OCCC VUPKGFBOKBGHFZ-UHFFFAOYSA-N 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229940093499 ethyl acetate Drugs 0.000 description 1
- QKBJDEGZZJWPJA-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound [CH2]COC(=O)OCCC QKBJDEGZZJWPJA-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052730 francium Inorganic materials 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N germanium monoxide Inorganic materials [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 229910021473 hassium Inorganic materials 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001387 inorganic aluminate Inorganic materials 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- YADSGOSSYOOKMP-UHFFFAOYSA-N lead dioxide Inorganic materials O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 1
- XMFOQHDPRMAJNU-UHFFFAOYSA-N lead(II,IV) oxide Inorganic materials O1[Pb]O[Pb]11O[Pb]O1 XMFOQHDPRMAJNU-UHFFFAOYSA-N 0.000 description 1
- 229910001547 lithium hexafluoroantimonate(V) Inorganic materials 0.000 description 1
- 229910001540 lithium hexafluoroarsenate(V) Inorganic materials 0.000 description 1
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Inorganic materials [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 1
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
- 229910001537 lithium tetrachloroaluminate Inorganic materials 0.000 description 1
- 229910000686 lithium vanadium oxide Inorganic materials 0.000 description 1
- HSFDLPWPRRSVSM-UHFFFAOYSA-M lithium;2,2,2-trifluoroacetate Chemical compound [Li+].[O-]C(=O)C(F)(F)F HSFDLPWPRRSVSM-UHFFFAOYSA-M 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000006051 mesophase pitch carbide Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- VNKYTQGIUYNRMY-UHFFFAOYSA-N methoxypropane Chemical compound CCCOC VNKYTQGIUYNRMY-UHFFFAOYSA-N 0.000 description 1
- 229940017219 methyl propionate Drugs 0.000 description 1
- KKQAVHGECIBFRQ-UHFFFAOYSA-N methyl propyl carbonate Chemical compound CCCOC(=O)OC KKQAVHGECIBFRQ-UHFFFAOYSA-N 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- PYLWMHQQBFSUBP-UHFFFAOYSA-N monofluorobenzene Chemical compound FC1=CC=CC=C1 PYLWMHQQBFSUBP-UHFFFAOYSA-N 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052699 polonium Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910021481 rutherfordium Inorganic materials 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 229910021477 seaborgium Inorganic materials 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052713 technetium Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- UFHILTCGAOPTOV-UHFFFAOYSA-N tetrakis(ethenyl)silane Chemical compound C=C[Si](C=C)(C=C)C=C UFHILTCGAOPTOV-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 125000001814 trioxo-lambda(7)-chloranyloxy group Chemical group *OCl(=O)(=O)=O 0.000 description 1
- ZMQDTYVODWKHNT-UHFFFAOYSA-N tris(2,2,2-trifluoroethyl) phosphate Chemical compound FC(F)(F)COP(=O)(OCC(F)(F)F)OCC(F)(F)F ZMQDTYVODWKHNT-UHFFFAOYSA-N 0.000 description 1
- CBIQXUBDNNXYJM-UHFFFAOYSA-N tris(2,2,2-trifluoroethyl) phosphite Chemical compound FC(F)(F)COP(OCC(F)(F)F)OCC(F)(F)F CBIQXUBDNNXYJM-UHFFFAOYSA-N 0.000 description 1
- QJMMCGKXBZVAEI-UHFFFAOYSA-N tris(trimethylsilyl) phosphate Chemical compound C[Si](C)(C)OP(=O)(O[Si](C)(C)C)O[Si](C)(C)C QJMMCGKXBZVAEI-UHFFFAOYSA-N 0.000 description 1
- VMZOBROUFBEGAR-UHFFFAOYSA-N tris(trimethylsilyl) phosphite Chemical compound C[Si](C)(C)OP(O[Si](C)(C)C)O[Si](C)(C)C VMZOBROUFBEGAR-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
- H01M2300/0037—Mixture of solvents
- H01M2300/0042—Four or more solvents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to anon-aqueous electrolyte solution for a lithium secondary battery, comprising an additive which may form a robust SEI film, and a lithium secondary battery capable of suppressing an increase in initial resistance and improving output characteristics by including the same.
- a secondary battery is a technology that is most suitable for various applications among developed technologies, and among the secondary batteries, a lithium ion battery, which may be miniaturized to be applicable to a personal IT device and has the highest energy density, is in the spotlight.
- a lithium ion battery is composed of a positive electrode comprised of a transition metal oxide containing lithium, a negative electrode comprised of a carbon-based material such as graphite capable of storing lithium, an electrolyte solution that is a medium for transferring lithium ions, and a separator. It is important to properly select these components in order to improve the electrochemical properties of the battery.
- PF6- anions are thermally decomposed from lithium salts such as LiPF6 contained in an electrolyte solution to form Lewis acids such as PF5, which react with moisture to generate HF.
- Materials such as PF5 or HF may not only destruct a film formed on the surface of an electrode, but also cause decomposition of an organic solvent.
- PF5 or HF may not only destruct a film formed on the surface of an electrode, but also cause decomposition of an organic solvent.
- a side reaction between the exposed surface of the electrode and the electrolyte solution causes the elution of transition metal ions from the positive electrode.
- the transition metal ions of the positive electrode are eluted, the lattice structure of the positive electrode becomes unstable, which leads to the generation of active oxygen in the positive electrode.
- the present invention aims to provide a non-aqueous electrolyte solution for a lithium secondary battery including an additive capable of providing a SEI enhancing effect, and a lithium secondary battery with improved output characteristics and a suppressed increase in battery resistance by including the same.
- a non-aqueous electrolyte solution for a lithium secondary battery which comprises a lithium salt, a non-aqueous organic solvent and a compound represented by the following Formula 1.
- R 1 and R 2 are each independently an alkylene group having 1 to 10 carbon atoms
- R 3 is an alkyl group having 1 to 20 carbon atoms which are substituted with one or more fluorines.
- a lithium secondary battery which includes a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; a separator disposed between the negative electrode and the positive electrode; and the non-aqueous electrolyte solution for a lithium secondary battery according to the present invention.
- the compound represented by Formula 1 included in the non-aqueous electrolyte for a lithium secondary battery of the present invention includes a propargyl group (-C ⁇ C-) and a fluorocarbon functional group substituted with one or more fluorine elements in the structure, it may be reduced before the organic solvent to form a low-resistance SEI film including a fluorocarbon component on the surface of the electrode, thereby suppressing additional reductive decomposition of the non-aqueous electrolyte solution.
- the expressions "a” and “b” in the description of "a to b carbon atoms” in the specification each denote the number of carbon atoms included in a specific functional group. That is, the functional group may include “a” to "b” carbon atoms.
- substitution denotes that at least one hydrogen bonded to carbon is substituted with an element other than hydrogen, for example, an alkyl group having 1 to 5 carbon atoms or a fluorine element.
- a film having passivation ability is formed on surfaces of a negative electrode and a positive electrode, while a non-aqueous electrolyte solution is decomposed during initial charge and discharge, to secure high-temperature storage characteristics.
- the film is deteriorated by Lewis acid materials such as HF and PF 5 generated by thermal decomposition of lithium salts (LiPF 6 , etc.) widely used in lithium ion batteries.
- the surface resistance of the electrode increases due to a change in the structure of the surface, and the theoretical capacity decreases as the metallic elements, which are the redox center, are lost, and thus expressing capacity may be reduced.
- the transition metal ions thus eluted are not only electrodeposited on the negative electrode reacting in a strong reduction potential range to consume electrons, but also destruct a film during electrodeposition to expose the surface of the negative electrode, which causes an additional electrolyte decomposition reaction. As a result, negative electrode resistance and irreversible capacity increase, thereby resulting in a continuous degradation of cell output characteristics.
- the present invention aims at providing a non-aqueous electrolyte solution for a lithium secondary battery capable of forming a low-resistance SEI film by including a compound comprising a propargyl group (-C ⁇ C-) and a fluorocarbon functional group substituted with one or more fluorine elements in the molecular structure as an additive, and a lithium secondary battery including the same.
- the present invention provides a non-aqueous electrolyte solution for a lithium secondary battery including a lithium salt, a non-aqueous organic solvent and a compound represented by Formula 1 below.
- R 1 and R 2 are each independently an alkylene group having 1 to 10 carbon atoms
- R 3 is an alkyl group having 1 to 20 carbon atoms substituted with one or more fluorines.
- any lithium salt typically used in an electrolyte solution for a lithium secondary battery may be used as the lithium salt without limitation, and, for example, the lithium salt may include Li + as a cation, and may include at least one selected from the group consisting of F - , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 -, AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , B 10 Cl 10 - , BF 2 C 2 O 4 - , BC 4 O 8 - , PF 4 C 2 O 4 - , PF 2 C 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF
- the lithium salt may include at least one selected from the group consisting of LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiPF 6 , LiSbF 6 , LiAsF 6 , LiB 10 Cl 10 , LiBOB (LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiTFSI (LiN(SO 2 CF 3 ) 2 ), LiFSI (LiN(SO 2 F) 2 ), LiCH 3 SO 3 , LiCF 3 CO 2 , LiCH 3 CO 2 and LiBETI (LiN (SO 2 CF 2 CF 3 ) 2 ) as an anion.
- the lithium salt may include a single material selected from the group consisting of LiBF 4 , LiClO 4 , LiPF 6 , LiBOB (LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiTFSI (LiN(SO 2 CF 3 ) 2 ), LiFSI (LiN(SO 2 F) 2 ) and LiBETI (LiN(SO 2 CF 2 CF 3 ) 2 ), or a mixture of two or more thereof. More specifically, the lithium salt may includeLiPF 6 .
- the lithium salt may be appropriately changed in a normally usable range, but may be present in a concentration of 0.8 M to 3.0 M, specifically, 1.0 M to 3.0 M in the electrolyte solution to obtain an optimum effect of forming a film for preventing corrosion of a surface of an electrode.
- viscosity of the non-aqueous electrolyte solution may be controlled so that optimum impregnability may be achieved, and an effect of improving capacity characteristics and cycle characteristics of the lithium secondary battery may be obtained by improving mobility of lithium ions.
- the non-aqueous organic solvent may include at least one selected from a cyclic carbonate compound, a linear carbonate compound, and a linear ester compound.
- the cyclic carbonate compound is a highly viscous organic solvent which may well dissociate the lithium salt in a non-aqueous electrolyte solution due to high permittivity, wherein specific examples thereof may be at least one organic solvent selected from the group consisting of ethylene carbonate (EC),propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, and vinylene carbonate, and, among them, may include at least one of ethylene carbonate and propylene carbonate (PC).
- EC ethylene carbonate
- PC propylene carbonate
- PC propylene carbonate
- the linear carbonate compound is an organic solvent having low viscosity and low permittivity, wherein typical examples thereof may be at least one organic solvent selected from the group consisting of dimethyl carbonate (DMC),diethyl carbonate (DEC),dipropyl carbonate, ethylmethyl carbonate (EMC), methylpropyl carbonate, and ethylpropyl carbonate, and specifically may include ethylmethyl carbonate (EMC).
- DMC dimethyl carbonate
- DEC diethyl carbonate
- EMC ethylmethyl carbonate
- EMC ethylmethyl carbonate
- methylpropyl carbonate methylpropyl carbonate
- ethylpropyl carbonate methylpropyl carbonate
- EMC ethylmethyl carbonate
- linear ester compound may be one selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate and butyl propionate, and may typically include at least one of ethyl propionate and propyl propionate.
- a mixed solvent of a cyclic carbonate compound, a linear carbonate compound, and a linear ester compound may be used as the non-aqueous organic solvent.
- the cyclic carbonate compound may be included in an amount of 50 vol% or less specifically 40 vol% or less, preferably 30 vol% or less, based on the total content of the non-aqueous organic solvent of the present invention.
- the non-aqueous organic solvent may further include at least one of a cyclic ester compound, an ether-based compound, an amide-based compound and a nitrile-based compound.
- the cyclic ester compound may be at least one selected from the group consisting of ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -valerolactone, and ⁇ -caprolactone.
- any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methylethyl ether, methylpropyl ether and ethylpropyl ether or a mixture of two or more of these may be used as the ester-based compound.
- the nitrile-based compound may be at least one selected from the group consisting of acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane carbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile,and 4-fluorophenylacetonitrile.
- the remainder excluding the lithium salt and additive in the non-aqueous electrolyte solution of the present invention may all be non-aqueous organic solvents unless otherwise stated.
- the non-aqueous electrolyte solution for a lithium secondary battery of the present invention may include a compound represented by the following Formula 1 as an electrolyte solution additive.
- R 1 and R 2 are each independently an alkylene group having 1 to 10 carbon atoms; and R 3 is an alkyl group having 1 to 20 carbon atoms which are substituted with one or more fluorines.
- the compound represented by Formula 1 includes a propargyl functional group in its structure and is easily reduced and decomposed on the surface of the negative electrode to form an SEI film having low resistance and high passivation ability. Accordingly, the durability of the negative electrode itself may be improved, but the transition metals may be prevented from being electrodeposited on the surface of the negative electrode, thereby preventing the self-discharge reaction of graphite-based and silicon-based negative electrodes due to the additional reduction and decomposition reaction of the electrolyte solution caused by the instability of the SEI film.
- the compound represented by Formula 1 forms a film which has secured oxidation resistance on the surface of the positive electrode by including a fluorocarbon functional group in which one or more fluorine elements are substituted at the end of the structure to suppress the elution of metallic impurities from the positive electrode and suppress the eluted metal ions from being electrodeposited and precipitated on the negative electrode, thereby preventing an internal short circuit.
- the non-aqueous electrolyte solution of the present invention includes a compound represented by Formula 1 including a fluorocarbon functional group substituted with one or more fluorine elements and propargyl group having excellent flame retardancy and non-flammability as an additive to form a robust SEI film having low resistance, thereby suppressing additional reductive decomposition of the non-aqueous electrolyte solution, but also preventing the self-discharge reaction of the negative electrode.
- a lithium secondary battery that suppresses an increase in initial resistance and has improved room temperature and low-temperature output characteristics may be manufactured.
- R 1 and R 2 may each independently be an alkylene group having 1 to 5 carbon atoms
- R 3 may be an alkyl group having 3 to 20 carbon atoms substituted with one or more fluorines.
- R 1 and R 2 may each independently be an alkylene group having 1 to 3 carbon atoms, and R 3 may be an alkyl group having 3 to 15 carbon atoms substituted with one or more fluorines.
- R 3 may be an alkyl group having 3 to 10 carbon atoms substituted with one or more fluorines.
- the compound represented by Formula 1 may be at least one of the compounds represented by the following Formula 1a to Formula 1c.
- the compound represented by Formula 1 may be included in an amount of 0.01 wt% to 10.0 wt% based on the total weight of the non-aqueous electrolyte solution for a lithium secondary battery.
- a low-resistance SEI film is formed on the surface of the negative electrode, while minimizing disadvantages such as side reactions, capacity degradation and resistance increase caused by additives, which may improve the effect of transferring the lithium.
- the self-discharge reaction of the negative electrode may be prevented by suppressing the additional reduction decomposition reaction of the electrolyte solution.
- a stable film is formed during the operation of the battery.
- viscosity of the non-aqueous electrolyte solution may be controlled so that optimum impregnability may be achieved, an increase in battery resistance due to the decomposition of additives may be effectively suppressed, and the ionic conductivity in the battery may be also further increased to prevent the degradation of output characteristics.
- the compound represented by Formula 1 may be included in an amount of 0.1 wt% to 6.0 wt%, specifically 0.5 wt% to 5 wt%, preferably 0.5 wt% to 3 wt% in the non-aqueous electrolyte solution.
- the non-aqueous electrolyte solution for a lithium secondary battery of the present invention may further include other additional additives in addition to the compound represented by Formula 1, if necessary, in order to prevent the collapse of the negative electrode from occurring due to the decomposition of the non-aqueous electrolyte solution in a high power environment or to further improve low-temperature high rate discharge characteristics, high-temperature stability, overcharge prevention, and an effect of suppressing battery swelling at high temperatures.
- Examples of the other additive may be at least one selected from the group consisting of a cyclic carbonate-based compound, a halogen-substituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based or phosphite-based compound, a borate-based compound, a nitrile-based compound, a benzene-based compound, an amine-based compound, a silane-based compound, and a lithium salt-based compound.
- the cyclic carbonate-based compound may include vinylene carbonate (VC) or vinyl ethylene carbonate (VEC).
- VC vinylene carbonate
- VEC vinyl ethylene carbonate
- the halogen-substituted carbonate-based compound may be fluoroethylene carbonate (FEC).
- FEC fluoroethylene carbonate
- the sultone-based compound may be at least one compound selected from the group consisting of 1,3-propane sultone (PS),1,4-butane sultone, ethane sultone, 1,3-propene sultone (PRS), 1,4-butene sultone, and 1-methyl-1,3-propenesultone.
- PS 1,3-propane sultone
- PRS 1,3-propene sultone
- 1-methyl-1,3-propenesultone 1-methyl-1,3-propenesultone
- the sulfate-based compound may be ethylene sulfate (ESa), trimethylene sulfate (TMS), or methyl trimethylene sulfate (MTMS).
- ESa ethylene sulfate
- TMS trimethylene sulfate
- MTMS methyl trimethylene sulfate
- the phosphate-based or phosphite-based compound may be at least one compound selected from the group consisting of lithium difluoro(bisoxalato)phosphate, lithium difluorophosphate,tris(trimethylsilyl)phosphate,tris(trimethylsi lyl)phosphite, tris(2,2,2-trifluoroethyl)phosphate, and tris(trifluoroethyl)phosphite.
- the borate-based compound may include tetraphenylborate, and lithium oxalyldifluoroborate(LiODFB) or lithium bis(oxalato)borate(LiB(C 2 O 4 ) 2 ,LiBOB).
- the nitrile-based compound may, for example, be at least one compound selected from the group consisting of succinonitrile(SN), adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentanecarbonitrile, cyclohexanecarbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile.
- succinonitrile(SN) succinonitrile
- adiponitrile acetonitrile
- propionitrile propionitrile
- butyronitrile valeronitrile
- caprylonitrile caprylonitrile
- heptanenitrile cyclopentanecarbonitrile
- the benzene-based compound may be fluorobenzene
- the amine-based compound may be triethanolamine or ethylenediamine
- the silane-based compound may be tetravinylsilane.
- the lithium salt-based compound is a compound different from the lithium salt included in the non-aqueous electrolyte solution, wherein the lithium salt-based compound may include lithium difluorophosphate (LiPO 2 F 2 ) or LiBF 4 .
- Two or more compounds may be mixed and used as the other additives, and the total content of the compound represented by Formula 1 and other additives may be included in an amount of 50 wt% or less, specifically 0.05 to 20 wt%, specifically 0.05 to 10 wt%, based on the total weight of the non-aqueous electrolyte solution.
- the amount of the other additives satisfies the above range, the low-temperature output characteristics of the battery may be improved and high-temperature storage characteristics and high-temperature lifespan characteristics may be more effectively improved. The occurrence of battery side reactions caused by the remaining additives after the reaction may be also prevented.
- a lithium secondary battery including the non-aqueous electrolyte solution for a lithium secondary battery of the present invention.
- the lithium secondary battery may include a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and the above-described non-aqueous electrolyte solution for a lithium secondary battery.
- the lithium secondary battery of the present invention may be prepared by injecting the non-aqueous electrolyte solution of the present invention.
- the lithium secondary battery of the present invention may be prepared according to a conventional method known in the art and used, and a method of preparing the lithium secondary battery of the present invention is specifically the same as that described later.
- the positive electrode according to the present invention may include a positive electrode active material layer including a positive electrode active material, and, if necessary, the positive electrode active material layer may further include a conductive agent and/or a binder.
- a lithium transition metal oxide including lithium and at least one metal selected from cobalt, manganese, nickel, or aluminum and may specifically include at least one of a lithium-manganese-based oxide, a lithium iron phosphate and a lithium-nickel-manganese-cobalt-based oxide (
- the lithium-manganese-based oxide may be LiMnO 2 or LiMn 2 O 4
- the lithium iron phosphate may be LiFePO 4 .
- the lithium-nickel-manganese-cobalt-based oxide may include at least one selected from the group consisting of Li(Ni 1/3 Mn 1/3 Co 1/3 )O 2 , Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 , Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 and Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 ,and it is desirable to include a transition metal oxide in which a nickel content is 60 atm% or more. That is, higher capacity may be achieved as an amount of the nickel among the transition metals is increased.
- Such lithium complex oxide may be at least one selected from the group consisting of Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 and Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 .
- the positive electrode active material may include lithium-cobalt-based oxide (e.g., LiCoO 2 , etc.), lithium-nickel-based oxide (e.g., LiNiO 2 , etc.), lithium-nickel-manganese-based oxide (e.g., LiNi 1-Y Mn Y O 2 (where 0 ⁇ Y ⁇ 1), LiMn 2-z Ni z O 4 (where 0 ⁇ Z ⁇ 2)), lithium-nickel-cobalt-based oxide (e.g., LiNi 1-Y1 Co Y1 O 2 (where 0 ⁇ Y1 ⁇ 1)), lithium-manganese-cobalt-based oxide (e.g., LiCo 1-Y2 Mn Y2 O 2 (where 0 ⁇ Y2 ⁇ 1), LiMn 2-Z1 Co Z1 O 4 (where 0 ⁇ Z1 ⁇ 2)), lithium-nickel-manganese-cobalt-based oxide (e.g., Li(Ni p1 Co), LiNi 1-Y Mn Y
- the positive electrode active material may be present in an amount of 90 wt% to 99 wt%, specifically, 93 wt% to 98 wt% based on a total weight of solid content in the positive electrode active material layer.
- the conductive agent is not particularly limited as long as it has conductivity without causing chemical changes in the battery, and for example, a conductive material such as carbon powder such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black; graphite powder such as natural graphite with a well-developed crystal structure, artificial graphite, or graphite; conductive fibers such as carbon fibers or metal fibers; conductive powder such as fluorocarbon powder, aluminum powder, and nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxide such as titanium oxide; or polyphenylene derivatives, may be used.
- a conductive material such as carbon powder such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black
- graphite powder such as natural graphite with a well-developed crystal structure, artificial graphite, or graphite
- conductive fibers such as carbon fibers or metal fibers
- conductive powder
- the conductive agent is generally included in an amount of 1 to 30wt% based on the total weight of the solid content in the positive electrode active material layer.
- the binder is a component that assists in the binding between positive electrode active material particles and in the binding between the positive electrode active material and the current collector, wherein the binder is commonly added in an amount of 1 wt% to 30 wt% based on the total weight of the solid content in the positive electrode active material layer.
- the binder may be a fluorine resin-based binder including polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE); a rubber-based binder including a styrene butadiene rubber (SBR), an acrylonitrile-butadiene rubber, or a styrene-isoprene rubber; a cellulose-based binder including carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, or regenerated cellulose; a polyalcohol-based binder including polyvinyl alcohol; a polyolefin-based binder including polyethylene or polypropylene; a polyimide-based binder; a polyester-based binder; and a silane-based binder.
- PVDF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- a rubber-based binder including a styrene butadiene rubber (SBR), an acrylon
- the positive electrode of the present invention as described above may be prepared by a method of preparing a positive electrode which is known in the art.
- the positive electrode may be prepared by a method in which a positive electrode collector is coated with a positive electrode slurry, which is prepared by dissolving or dispersing the positive electrode active material, the binder, and/or the conductive agent in a solvent and then dried and rolled to form a positive electrode active material layer, or may be prepared by casting the positive electrode active material layer on a separate support, and then laminating a film separated from the support on the positive electrode collector.
- the positive electrode collector is not particularly limited as long as it has conductivity without causing adverse chemical changes in the battery, and, for example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like may be used.
- the solvent may include organic solvents such as NMP(N-methyl-2-pyrrolidone), etc., and may be used in an amount such that desirable viscosity is obtained when the positive electrode active material as well as optionally the binder and the conductive agent are included.
- organic solvents such as NMP(N-methyl-2-pyrrolidone), etc.
- it may be included so that the solid content concentration in the active material slurry including the positive electrode active material and optionally the binder and the conductive material is in the range of 10 wt% to 70 wt%, preferably 20 wt% to 60 wt%.
- the negative electrode according to the present invention includes a negative electrode active material layer including a negative electrode active material, and the negative electrode active material layer may further include a conductive agent and/or a binder, if necessary.
- the negative electrode active material may include at least one selected from the group consisting of a carbon material capable of reversibly intercalating/deintercalating lithium ions, metal or an alloy of lithium and the metal, a metal composite oxide, a material which may be doped and undoped with lithium, and a transition metal oxide.
- a carbon-based negative electrode active material generally used in a lithium ion secondary battery may be used without particular limitation, and, as a typical example, crystalline carbon, amorphous carbon, or both thereof may be used.
- the crystalline carbon may be graphite such as irregular, planar, flaky, spherical, or fibrous natural graphite or artificial graphite
- examples of the amorphous carbon may be soft carbon (low-temperature sintered carbon) or hard carbon, mesophase pitch carbide, and fired cokes.
- a metal selected from the group consisting of Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al and Sn or an alloy of lithium and the metal may be used.
- the material which may be doped and undoped with the lithium, may include Si, SiO x (0 ⁇ x ⁇ 2), a Si-Y alloy (where the Y is an element selected from the group consisting of alkali metal, alkaline earth metal, a Group 13 element, a Group 14 element, transition metal, a rare earth element, and a combination thereof, and is not Si), Sn, SnO 2 , and Sn-Y (where the Y is an element selected from the group consisting of alkali metal, alkaline earth metal, a Group 13 element, a Group 14 element, transition metal, a rare earth element, and a combination thereof, and is not Sn), and a mixture of SiO 2 and at least one thereof may also be used.
- the element Y may be selected from the group consisting of Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Ge, P, As, Sb, Bi, S, Se, Te, Po, and a combination thereof.
- the transition metal oxide may include lithium-containing titanium composite oxide (LTO), vanadium oxide, and lithium vanadium oxide.
- LTO lithium-containing titanium composite oxide
- vanadium oxide vanadium oxide
- lithium vanadium oxide lithium vanadium oxide
- the negative electrode active material may be present in an amount of 80 wt% to 99 wt% based on a total weight of the solid content in the negative electrode active material layer.
- the conductive agent is a component for further improving the conductivity of the negative electrode active material, wherein the conductive agent may be added in an amount of 1 wt% to 20 wt% based on the total weight of the solid content in the negative electrode active material layer.
- Any conductive agent may be used without particular limitation so long as it has conductivity without causing adverse chemical changes in the battery, and, for example, a conductive material such as: graphite powder such as natural graphite and artificial graphite; carbon black such as acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers and metal fibers; conductive powder such as fluorocarbon powder, aluminum powder, or nickel powder; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxide such as titanium oxide; or polyphenylene derivatives, may be used.
- the binder is a component that assists in the binding between the conductive agent, the active material, and the current collector, wherein the binder is commonly added in an amount of 1wt% to 30wt% based on the total weight of the solid content in the negative electrode active material layer.
- the binder may be a fluorine resin-based binder including polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE); a rubber-based binder including a styrene-butadiene rubber (SBR), an acrylonitrile-butadiene rubber, or a styrene-isoprene rubber; a cellulose-based binder including carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, or regenerated cellulose; a polyalcohol-based binder such as polyvinyl alcohol; a polyolefin-based binder including polyethylene or polypropylene; a polyimide-based binder; a polyester-based binder; and a silane-based binder.
- PVDF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- SBR styrene-butadiene rubber
- CMC carboxymethylcellulose
- the negative electrode may be prepared by a method of preparing a negative electrode which is known in the art.
- the negative electrode may be prepared by a method in which a negative electrode collector is coated with a negative electrode slurry, which is prepared by dissolving or dispersing the negative electrode active material as well as selectively the binder and the conductive agent in a solvent, rolled and dried to form a negative electrode active material layer, or may be prepared by casting the negative electrode active material layer on a separate support and then laminating a film separated from the support on the negative electrode collector.
- the negative electrode collector may typically have a thickness of 3 um to 500 um.
- the negative electrode collector is not particularly limited as long as it has high conductivity without causing adverse chemical changes in the battery, and, for example, copper, stainless steel, aluminum, nickel, titanium, fired carbon, copper or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like, and an aluminum-cadmium alloy may be used. Similar to the positive electrode collector, microscopic irregularities may be formed on the surface of the collector to improve the adhesion of the negative electrode active material.
- the negative electrode collector for example, may be used in various shapes such as that of a film, a sheet, a foil, a net, a porous body, a foam body, a non-woven fabric body, and the like.
- the solvent may include water or an organic solvent such as NMP and alcohol, and may be used in an amount such that desirable viscosity is obtained when the negative electrode active material as well as optionally the binder and the conductive agent are included.
- the solvent may be included in an amount such that a concentration of the solid content in the negative electrode slurry including the negative electrode active material as well as optionally the binder and the conductive agent is in a range of 50 wt% to 75 wt%, preferably 50 wt% to 65wt%.
- the lithium secondary battery according to the present invention includes a separator between the positive electrode and the negative electrode.
- any separator may be used without particular limitation as long as it is typically used as the separator in a lithium secondary battery, and particularly, a separator having high moisture-retention ability for an electrolyte due to low resistance to the transfer of electrolyte ions may be desirable.
- a porous polymer film generally used, for example, a porous polymer film prepared from a polyolefin-based polymer, such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate copolymer, or a laminated structure of two layers or more of these may be used.
- a porous polymer film prepared from a polyolefin-based polymer, such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate copolymer, or a laminated structure of two layers or more of these may be used.
- the lithium secondary battery according to the present invention as described above may be suitably used in portable devices, such as mobile phones, notebook computers, and digital cameras, and electric cars such as hybrid electric vehicles (HEVs).
- portable devices such as mobile phones, notebook computers, and digital cameras
- electric cars such as hybrid electric vehicles (HEVs).
- HEVs hybrid electric vehicles
- a battery module including the lithium secondary battery as a unit cell and a battery pack including the battery module are provided.
- the battery module or the battery pack may be used as a power source of at least one medium and large sized device of a power tool; electric cars including an electric vehicle (EV), a hybrid electric vehicle, and a plug-in hybrid electric vehicle (PHEV); or a power storage system.
- electric cars including an electric vehicle (EV), a hybrid electric vehicle, and a plug-in hybrid electric vehicle (PHEV); or a power storage system.
- a shape of the lithium secondary battery of the present invention is not particularly limited, but a cylindrical type using a can, a prismatic type, a pouch type, or a coin type may be used.
- the lithium secondary battery according to the present invention may not only be used in a battery cell that is used as a power source of a small device, but may also be used as a unit cell in a medium and large sized battery module including a plurality of battery cells.
- LiPF 6 was dissolved in a non-aqueous organic solvent, in which ethylene carbonate (EC), propylene carbonate (PC), ethyl propionate (EP) and propyl propionate (PP) were mixed in a volume ratio of 20:10:20:50, such that a concentration of the LiPF 6 was 1.0 M
- a non-aqueous electrolyte solution was prepared by adding 0.1 wt% of a compound represented by Formula 1a, and 0.5 wt% of vinylene carbonate (hereinafter "VC"), 1.0 wt% of 1,3-propanesultone (hereinafter "PS”), 5.0 wt% of fluoroethylene carbonate (hereinafter “FEC”), 1.0 wt% of succinonitrile (hereinafter “SN”) and 0.5 wt% of lithium oxalyldifluoroborate (hereinafter "LiODFB”) as other additives (see Table 1 below).
- VC vinylene carbonate
- a positive electrode active material particle LiCoO 2
- a conductive agent carbon black
- a binder polyvinylidene fluoride
- NMP N-methyl-2-pyrrolidone
- a positive electrode collector Al thin film with a thickness of 15 um was coated with the positive electrode slurry, dried, and then roll-pressed to prepare a positive electrode.
- a negative electrode active material graphite
- a binder SBR-CMC
- a conductive agent carbon black
- a negative electrode collector Cu thin film with a thickness of 6um, was coated with the negative electrode slurry, dried, and then roll-pressed to prepare a negative electrode.
- An electrode assembly was prepared by sequentially stacking the positive electrode, a polyolefin-based porous separator coated with inorganic particles (Al 2 O 3 ), and the negative electrode.
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 1.0 wt% of a compound represented by Formula 1a, and 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 5.0 wt% of a compound represented by Formula 1a, and 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 11.0 wt% of a compound represented by Formula 1a, and 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 1.0 wt% of a compound represented by Formula 1b, and 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 1.0 wt% of a compound represented by Formula 1c, and 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding 0.5 wt% of VEC, 1.0 wt% of PS, 5.0 wt% of FEC, 1.0 wt% of SN and 0.5 wt% of LiODFB as other additives (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 1 except that a non-aqueous electrolyte solution was prepared by adding a compound represented by the following Formula 2 instead of a compound represented by Formula 1a (see Table 1 below).
- a lithium secondary battery was prepared in the same manner as in Example 2 except that a non-aqueous electrolyte solution was prepared by adding a compound represented by the following Formula 2 instead of a compound represented by Formula 1a (see Table 1 below).
- a non-aqueous electrolyte solution was prepared by adding a compound represented by the following Formula 2 instead of a compound represented by Formula 1a (see Table 1 below).
- Formula 1a Lithium salt Non-aqueous organic solvent Additives Other additives Amount (wt%) Formula Amount (wt%)
- Example 2 1a 1.0
- Example 3 1a 5.0
- Example 4 1a 11.0
- Example 5 1b
- Example 6 1c 1.0 Comparative Example 1 - - Comparative Example 2 2 0.1 Comparative Example 3 2 1.0
- the initial interface resistance was calculated from the amount of voltage drop measured using VMP3 (manufactured by Biologics), and the results are presented in Table 2 below by expressing the same as a contrast ratio (%) with respect to the secondary battery of Comparative Example 1.
- Capacity retention % discharge capacity after 200 cycles / discharge capacity after 1 cycle ⁇ 100 [Table 2] Room temperature (25°C) Interfacial resistance (%) Discharge Capacity (mAh) Capacity retention rate (%)
- Example 6 -9.7 4971 96.6 Comparative Example 1 Standard 4765 92.0 Comparative Example 2 1.4 4710 90.8 Comparative Example 3 3.8 4683 88.2
- the secondary batteries of Examples 1 to 3, 5 and 6 of the present invention improved all the interfacial resistance (%) at room temperature (25°C), discharge capacity (mAh), and capacity retention rate (%) after the 200 cycles compared to the secondary batteries of Comparative Examples 1 to 3.
- the 2C charging potential of the secondary batteries of Examples 1 to 3, 5, and 6 at a low temperature is 4.10 V or less, and may be charged at a lower potential compared with the secondary batteries of Comparative Examples 1 to 3.
- the 2C charging potential was lower compared with the secondary battery of Example 1, which means that the overpotential has decreased.
- the effect of reducing resistance was more improved when the additive content was 1.0 wt% compared to when the additive content is 0.1 wt%.
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PCT/KR2022/015051 WO2023063648A1 (fr) | 2021-10-12 | 2022-10-06 | Électrolyte non aqueux pour batterie secondaire au lithium et batterie secondaire au lithium le comprenant |
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